commit 195fe08421f3a6c52ed621be96dbcc5393b41e69
author mtklein <mtklein@chromium.org> Tue Nov 17 08:39:01 2015 -0800
committer Commit bot <commit-bot@chromium.org> Tue Nov 17 08:39:01 2015 -0800
tree ecf1161ef6d0781ff63b02d0589c37ea6d10ba6e
parent f3182ebc72db2bf2e24119d5cea05f270473a491

simplify BlendTest.cpp

  - streamline the testing down to just byte multiplies
    (that's always where the blend algorithms vary)
  - add another approximate multiply (x*y+255)>>8
  - add another variant of the perfect multiply, ((x*y+128)*257)>>16

I've realized ((x*y+128)*257)>>16 might be just as fast in SSE/NEON
as our current (x*y+x)>>8 approximation.  Good to be testing it here.

BUG=skia:

Review URL: https://codereview.chromium.org/1453043005